Table S3. Mediterranean native and endemic marine species reported by FishBase/SeaLifeBase by different taxa and current extent of coverage of AquaMaps.

Table S4. Proportion of checked or expert-reviewed AquaMaps for different taxa.

Table S5. Mediterranean species of special conservation concern covered by AquaMaps.

Table S6. Checklist of species included in AquaMaps of the Mediterranean Sea.

Seaweeds and Seagrasses (by Enric Ballesteros)

Table S7. Mediterranean biodiversity (species/infraspecific taxa, families, orders, classes) for the phyla Heterokontophyta, Rhodophyta, Chlorophyta and Magnoliophyta and all the macrophytobenthos. Total number of species/intraspecific taxa is also split into introduced, endemics and others.

Table S8. Percentage of introduced, endemics and other macrophytobenthic species/infraspecific taxa by phylum and totals.

Table S9. Checklist of the phylum Heterokontophyta and comments to the checklist.

Table S10. Checklist of the phylum Rhodophyta and comments to the checklist.

Table S11. Checklist of the phylum Chlorophyta and comments to the checklist.

Table S12. Checklist of the phylum Magnoliophyta and comments to the checklist.

Sponges (by Eleni Voultsiadou & Thanos Dailianis)

Figure S1. Mediterranean percentages of the world sponge families and genera for each demosponge order.

Figure S2. Distribution of the recorded demosponge species (outer circle) and genera (inner circle) richness in distinct zoogeographic areas of the Mediterranean.

Anthozoans (by Dimitris Vafidis)

Table S13. Checklist of the class Anthozoa (Phylum Cnidaria).

Mollusks (by José Templado & Roger Villanueva)

Table S14. Checklist of the phylum Mollusca.

Table S15. Number of Mediterranean species of each of the eight mollusks classes.

Polychaetes (by Daniel Martín & João Gil)

Table S16. Checklist of the class Polychaeta (Phylum Annelida).

Cumaceans (by Jordi Corbera)

Table S17. Checklist of the order Cumacea (Phylum Arthropoda), with enumeration of references in each region of the Mediterranean Sea.

Table S18. Species number of cumaceans known in different Mediterranean regions.

Mysidaceans (by Carles San Vicente)

Table S19. Checklist of the orders Mysida and Lophogastrida (Phylum Arthropoda) known in the different Mediterranean regions considered.

Table S20. Species number of mysidaceans known in the world and in the Mediterranean Sea. Endemics and its percentage for each family are also indicated.

Figure S3. Number of mysidacean species recorded in each of the main biogeographical zones of the Mediterranean Sea.

Decapods (by Carlo Froglia)

Table S21. Checklist of the Mediterranean endemic species of the Order Decapoda (Phylum Arthropoda), known geographic distribution and bathymetric range.

Bryozoans (Carlos Mª López-Fé de la Cuadra)

Text S3. References for Mediterranean bryozoan species.

Table S22. Checklist of the phylum Bryozoa.

Echinoderms (by Athanasios Koukouras & Miltiadis-Spyridon Kitsos)

Text S4. References for Mediterranean Echinoderms diversity.

Table S23. Checklist of the phylum Echinodermata, and their distribution in the geographical areas of the Mediterranean with reference to their presence in the Atlantic and the Indo-Pacific Oceans.

Figure S4. Distribution of the known species of echinoderms in the main geographical areas of the Mediterranean, as real numbers (parentheses) and percentages of the total Mediterranean species.

Figure S5. Percentages of the four zoogeographical categories in the Mediterranean territorial areas and the Black Sea.